Paper drier



Oct. 15, 1929. s. B. STAFFORD ET AL 1,731,876

PAPER DRIER Filed July 25, 1926 2 Sheets-Sheet 1 Oct. 15, 1929. s. B.STAFFOI'RD ET AL 133L876 PAPER DRIER Filed July 23, 1928 2 Sheets-Sheet2 I i J57:

EJ'TEPEZEEN B. STAFFORD, OF OXFORD, AND

MAElSACI-TUQETTS, A SIGNORS TO RICE This invention relates to that typeof driers used to receive a web of paper in a wet condition and dry it.

The principal objects of the invention are to provide a continuousmachine for this purpose which shall combine the advantages of theso-called slat-driers, the so-called air drier and the so-called festoondrier and retain the coclrle in the paper; to provide a machine whichwill dry at large amount of paper and occupy a small space; to provide aconstruction in which the strain on the slatted drums employed will bematerially reduced 011 account of the way in which they are mounted; toprovide a machine which will distribute the heated air or other heatingmedium with sufficient circulation without the employment of fans orother means for assisting in its distribution; to provide an goarrangement of the slatted drums, one over the other, for the purpose ofreducing the ground space necessary for the thorough drying of the webbefore it leaves the drier; and to provide a driving means by which oneseries of drums will. be driven directly and accurately at the samespeed and for driving the other series in a similar manner there-' from.

Other objects and advantages of the invention will appear hereinafter. I

Reference is to be had to the accompzmying drawings in which 1 is a sideview of a drying machine constructed in accordance with. this inventionwith some of the par shown diagrammatically;

Fig. 2 is a sectional view on the line 2-2 of n lg. 1, showing one ofthe drums in elevation and the other in section;

at) Fig 3 is a sectional view on the line 33 of Fig. 1, and

Fig. l is a sectional view on the line l-l of Fig. 1.

There are several methods of drying paper at in wet condition, dependingsomewhat on the type of paper which is being made. Some of them lnvolvea second drying after sizing or otherwise treated. Among the devices forthis purpose are the so-called slat driers, u c r air T1 is an driersand the :restoon dricrs.

lTltiTt fiTA'lES PATENT OFFICE JOHN WARREN VEDDER, 0F -W0lEi-CESTIER,BARTON &: FALES, INCORPORATED, OF

A CORPORATION OF MASSACHUSETTS DRIER.

1928. Serial No. 294,621.

invention is designed to combine their advantages and at the same timeto secure the advantages of their systems.

Referring to the drawings it will be seen that the web of paper W isdrawn over a carrying roll 11 into the drying machine which comprises aframe 10. The paper passes upwardly, in this case, to a slat drum 12around more than the half of the surface of which it passes on accountof the particti- ]ar arrangement of this drum relative to a lower drum12. The paper passes in the same way over and under a series of upperand lower drums, shown in this case as divided into two series of lowerdrums and two series of upper drums, and finally it comes out under thelast of the lower drums 12 and over a carrying roll 13 where it isdelivered in a dried condition. The lower and upper drums are separateda considerable distance to allow for adequate drying.

For the driving of these drums in the two series there is a drivingshaft 14 in each of the lower series on which is a gear 15. This gearmeshes with two gears 16 on the ends of two of the drums 12, therebydriving both of these drums in the same direction. It will be understoodthat the invention is not limited to two series of three drums each atthe bottom and top as shown but, however many of these drums there are,they are all provided with the gear 16 and driven by gears 15.

At some point along the series, as for example a shaft 17 on which oneof the gears 15 is mounted, is a sprocket wheel 18 011 the same shaft.This sprocket wheel by means of a chain 19 drives a sprocket 20 on oneot the drums 12 of the upper series. This particular gear 16 drives twogears 15 like those mentioned below located on short shafts which inturn drive the gears 16 on the drums 12 on either side.

This system can be extended in accordance with this invention throughouta greater number than that shown if desired. In this case both of theseries are driven in the same way from two shafts 14:, they being shownas exactly alike. This results in the driving of all the drums at thesame surface speed as they are positively connected with each other.

It will be seen that in the arrangement of the drums, those at the topare located directly .over those at the bottom. On account of the way inwhich the web is carried over and under the drums, it will be seen thatit passes backwardly from each upper drum to the lower-drum under whichit passes and that, for that reason, the web passes more than half wayaround each upper drum.

A corresponding arrangement is provided at the bottom so that the sameresult is secured there. This is advisable because these are open drums,as will appear, and this enables the heating medium to operateconveniently on a comparatively long length of paper as it passes aroundeach drum.

The heat that emerges through the drum at the bottom of the upper drumsand the tops of the lower drums escapes slowly because it is confinedbetween the converging strands of the web and heating takes place evenafter the web has left each drum and before it reaches it. -The heateventually escape-s at the top and sides but there is no place where acurrent of moisture-laden heated air will encounter the edges of the weband leave them more moist than the center.

Each of the drums is shown as mounted on a stationary shaft 21 which ishollow and is connected with a source of heating medium, as hot air,which enters through a pipe 22 from a suitable source of supply. Theother end of the shaft is closed by a plug 28 and, as stated, the pipesare fixed in brackets '24 on the frame 10. On these pipes are locatedanti-friction bearings 25 shown as of the ball type and carrying thehubs 26 at the opposite ends of each drum. Each drum is provided with aspider or spokes 27 extending from the hubs and having sockets '28 forreceiving slats 29. These slats extend the length of the drum and arespaced apart so that the web of paper runs on the slats, alone. Therestof the invention can be used with a drum keyed to a revolving shaft.

The gears 16 on these drums are located at one end of, and integralwith, the casting preferably which comprises the hub, spokes andsockets. Where the sprocket wheels 18 and 20are used,they are fastenedto the hub at one end.

It will be seen that this furnishes a positive drive which will secureuniform speed of all the drums, provides an arrangement of the drumswhich will efiiciently dry the paper and occupy a'comparatively smallspace for its dryingcapac'ity, and that the drums, being mounted onstationary tubes by means of anti-frictionbearings, are not badlystrained by the passage of the paper over them or the driving means,"although one end of each drum is connected with the driving end by askeleton frame-work. The advantages of the ordinary air drier are allretained and also the advantages of the so-called air or festoon systemsof drying are employed in the same machine.

Although we have illustrated and described only a single form of theinvention,

we are aware of the fact that modifications can be made therein by anyperson skilled in the art without departing from the scope of theinvention as expressed in the claims.

Therefore, we do not wish to be limited to all the details ofconstruction herein shown and described, but what we do claim is 1. In adrier for paper coming directly from a paper machine, the combination oftwo series of slatted heated drums for receiving the paper continuously,one series being spaced materially above the drums of the other series,a gear on each drum, shafts located between each two drums and eachhaving a gear thereon meshing with the gears on the two adjacent drumsfor rotating them all in the same direction, one of said sh alts in oneseries having a sprocket wheel thereoirand one of the drums in the otherseries having a sprocket wheel and a chain connecting said sprocketwheels whereby both series of drums will be driven simultaneously.

2. In a drier for paper coming directly from a paper machine, thecombination of two series of drums for receiving the paper continuously,one series being spaced above the other series, a gear on each drum,shafts located between each two drums and each having a gear thereonmeshing with the gears on the two adjacent drums for rotating them allin the same direction, means for driving one series from the other, astationary hollow shaft provided with perforations therein on which eachdrum is mounted to rotate and means for introducing a heating mediuminto each of said shafts.

3. In a drier for paper coming directly from a paper machine, thecombination of two series of slatted heated drums "for receiving thepaper continuously, one series being spaced materially from the drums ofthe other series, a gear on each drum of one series, shafts locatedbetween each two drums and each having a gear thereon meshing with thegears on the two adjacent drums for rotat ing them all in the samedirection.

In testimony whereof we have hereunto affixed our signatures.

STEPHEN B. STAFFORD. JOHN \VARREN VEDDER.

